Battery device and electric device

Abstract

Some embodiments of the present application provide a battery device and a power utilization device, the battery device comprises a battery monomer assembly, a connection line and a protection device, a conductive member of the protection device is connected in series in the connection line, and a first conductive portion and a second conductive portion are oppositely arranged along a first direction, at least part of the first conductive part and at least part of the second conductive part extend into the containing cavity of the shell, and a first conductive piece in the braking assembly is movably arranged in the containing cavity in the second direction intersecting with the first direction. The first conductive part connected to the first conductive part and the second conductive part is configured to be controlled to be disconnected from the first conductive part and the second conductive part, so that the first conductive part and the second conductive part are disconnected when the battery device is in a thermal runaway state, and a circuit of the battery device is cut off; the possibility of further thermal runaway of the battery device is reduced, and the reliability of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and in particular to a battery device and an electrical device. Background Art

[0002] Battery devices have the advantages of high specific energy and high power density, and are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] As the application scope of battery devices becomes wider and wider, how to improve the reliability of battery devices has attracted more and more attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, wherein the battery device can cut off the circuit when thermal runaway occurs, which is beneficial to improving the reliability of the battery device.

[0005] In a first aspect, some embodiments of the present application provide a battery device, which includes a battery cell assembly, a connecting circuit and a protective device, wherein the connecting circuit is used to electrically connect the battery cell assembly; the protective device includes a conductive member and an actuating assembly, wherein the conductive member is connected in series in the connecting circuit, and the conductive member includes a first conductive part and a second conductive part arranged opposite to each other along a first direction; the actuating assembly includes a shell and a first conductive member, wherein the shell forms a cavity, wherein at least a portion of the first conductive part extends into the cavity, and at least a portion of the second conductive part extends into the cavity, and the first conductive member is movably arranged in the cavity along a second direction, and the second direction is arranged to intersect with the first direction; the first conductive member is configured to be connected to the first conductive part and the second conductive part and can be controlled to disconnect the connection between the first conductive part and the second conductive part.

[0006] In the above structure, since the first conductive member connected to the first conductive part and the second conductive part is configured to be able to controllably disconnect the connection between the first conductive part and the second conductive part, the first conductive part and the second conductive part are disconnected in the thermal runaway state of the battery device, and the circuit of the battery device is cut off, thereby reducing the possibility of further thermal runaway of the battery device, which is beneficial to improving the reliability of the battery device.

[0007] According to the battery device provided in some embodiments of the present application, the first conductive member is sealingly and slidably connected to the inner wall of the cavity and divides the cavity into a first cavity and a second cavity, the shell is provided with a connecting port connected to the first cavity, and the connecting port is connected to the internal space of the battery device; the first conductive member is configured to disconnect the first conductive part and the second conductive part when the pressure of the internal space of the battery device reaches a first preset value, so that when the battery device has thermal runaway and the pressure of the internal space of the battery device reaches the first preset value, the first conductive member cuts off the electrical connection between the first conductive part and the second conductive part to cut off the circuit of the battery device, thereby reducing the possibility of further aggravation of thermal runaway of the battery device.

[0008] According to the battery device provided in some embodiments of the present application, the actuating assembly also includes a second conductive member, which is movably disposed in the first cavity along the second direction and is spaced apart from the first conductive member, the second conductive member is located between the first conductive member and the connecting port, and the first conductive member and the second conductive member transmit to each other; when the pressure of the internal space of the battery device reaches a first preset value, the second conductive member is connected to the first conductive part and the second conductive part; when the pressure of the internal space of the battery device reaches a second preset value, the second conductive member and the first conductive member both disconnect from the first conductive part and the second conductive part, and the second preset value is higher than the first preset value.

[0009] By causing the second conductive member and the first conductive member to disconnect from the first conductive part and the second conductive part when the pressure of the internal space of the battery device reaches a second preset value higher than the first preset value, it can be understood that when the battery device undergoes thermal diffusion to generate more smoke, so that the pressure of the internal space of the battery device further increases to the second preset value, the second conductive member and the first conductive member both disconnect from the first conductive part and the second conductive part under the action of the high-pressure gas, so that the electrical connection between the first conductive part and the second conductive part is disconnected, so that the circuit of the battery device is cut off, which is beneficial to reducing the possibility of further aggravation of thermal diffusion of the battery device.

[0010] According to the battery device provided by some embodiments of the present application, the distance between the second conductive part and the first conductive part in the second direction is A, and the smallest one of the size of the first conductive part in the second direction and the size of the second conductive part in the second direction is B, A>B, so that during the switching process of the first connection part and the second connection part, the first conductive part and the second conductive part are not connected, so that during the switching process of the first connection part and the second connection part, the first connection part and the second connection part are electrically disconnected, so that the circuit can issue a warning that the battery device has thermal runaway by cutting off the current.

[0011] According to the battery device provided in some embodiments of the present application, the actuating assembly further includes a first connecting member, which is connected to the first conductive member and the second conductive member. By connecting the first connecting member between the first conductive member and the second conductive member, the first conductive member and the second conductive member can be mutually transmitted, so that the first conductive member and the second conductive member can move synchronously.

[0012] According to the battery device provided in some embodiments of the present application, the second conductive member is sealingly slidably connected to the inner wall of the first cavity and divides the first cavity into a first sub-cavity and a second sub-cavity, the second sub-cavity is located between the first conductive member and the second conductive member, and the first sub-cavity is connected to the connecting port. By connecting the connecting port to the first sub-cavity, the second sub-cavity and the second cavity are sealed cavities, and when the smoke generated when the battery device has thermal runaway increases the pressure of the first sub-cavity, the gas in the first sub-cavity pushes the second conductive member to move along the second direction toward the direction where the first conductive member is located, and then the gas in the second sub-cavity is compressed and pushes the first conductive member to move along the second direction away from the second conductive member.

[0013] According to the battery device provided in some embodiments of the present application, the first conductive member is sealingly and slidably connected to the inner wall of the cavity and divides the cavity into a third cavity and a fourth cavity, the thermal expansion coefficient of the first substance in the fourth cavity is greater than the thermal expansion coefficient of the second substance in the third cavity, and the fourth cavity transfers heat to the battery cell assembly; when the internal temperature of the battery device reaches a third preset value, the first substance pushes the first conductive member to disconnect from the first conductive part and the second conductive part.

[0014] When the internal temperature of the battery device reaches a third preset value, the first material pushes the first conductive member to disconnect the first conductive part and the second conductive part, so that when thermal runaway of the battery device occurs and the internal temperature of the battery device reaches the third preset value, the first conductive member cuts off the electrical connection between the first conductive part and the second conductive part to cut off the circuit of the battery device, thereby reducing the possibility of further aggravation of thermal runaway of the battery device.

[0015] According to the battery device provided in some embodiments of the present application, the actuating assembly further includes a third conductive member, which is movably disposed in the fourth cavity along the second direction and spaced apart from the first conductive member, and the first conductive member and the third conductive member are mutually transmitted; when the internal temperature of the battery device reaches the third preset value, the third conductive member is connected to the first conductive part and the second conductive part; when the internal temperature of the battery device reaches the fourth preset value, the third conductive member and the first conductive member are both disconnected from the first conductive part and the second conductive part, and the fourth preset value is higher than the third preset value. When the internal temperature of the battery device rises to a fourth preset value higher than the third preset value, the third conductive member and the first conductive member are both disconnected from the first conductive part and the second conductive part, which may mean that when the battery device undergoes thermal diffusion to generate more heat, so that when the internal temperature of the battery device further rises to the fourth preset value, the third conductive member and the first conductive member are both disconnected from the first conductive part and the second conductive part under the action of the first substance, so that the electrical connection between the first conductive part and the second conductive part is disconnected, so that the circuit of the battery device is cut off, which is conducive to reducing the possibility of further aggravation of thermal diffusion of the battery device.

[0016] According to the battery device provided in some embodiments of the present application, the actuating assembly further includes a second connecting member, which is connected to the first conductive member and the third conductive member. By connecting the second connecting member between the first conductive member and the second conductive member, the first conductive member and the second conductive member can be mutually transmitted, so that the first conductive member and the second conductive member can move synchronously.

[0017] According to the battery device provided in some embodiments of the present application, the third conductive member is sealingly slidably connected to the inner wall of the fourth cavity and divides the fourth cavity into a third sub-cavity and a fourth sub-cavity, the third sub-cavity is located between the third conductive member and the first conductive member, and the first substance is disposed in the fourth sub-cavity. By disposing the first substance in the fourth sub-cavity, when the first substance is heated and expanded when thermal runaway occurs in the battery device, the first substance pushes the third conductive member to move along the second direction toward the direction where the first conductive member is located, and then the gas in the third sub-cavity is compressed and pushes the first conductive member to move along the second direction away from the third conductive member, so as to realize the connection or disconnection of the first conductive part and the second conductive part by the third conductive member.

[0018] According to the battery device provided in some embodiments of the present application, the battery device also includes a frame, and the housing, the first conductive part and the second conductive part are connected to the frame. The frame can be a structure arranged outside the battery device, which is used to protect other components in the battery device, reduce the possibility of damage to the battery device, and help improve the reliability of the battery device.

[0019] In a second aspect, some embodiments of the present application provide a battery device, which includes a battery cell assembly, a connecting circuit and a battery device as provided by any of the above technical solutions, wherein the connecting circuit is used to electrically connect the battery cell assembly, and the conductive parts of the battery device are connected in series in the connecting circuit.

[0020] By connecting the conductive element of the battery device in series in the connecting circuit, the conductive element can connect or disconnect the circuit passing through the connecting circuit.

[0021] According to the battery device provided in some embodiments of the present application, a plurality of battery cell assemblies are provided, and the plurality of battery cell assemblies are connected in series via a connection line.

[0022] In a third aspect, some embodiments of the present application provide an electrical device, which includes a battery device provided by the above technical solution, and the battery is used to provide electrical energy.

[0023] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0024] Some embodiments of the present application provide a battery device, which includes a battery cell assembly, a connection circuit and a protection device, wherein the conductive member of the protection device is connected in series in the connection circuit, wherein the first conductive part and the second conductive part are arranged opposite to each other along a first direction, at least a portion of the first conductive part and at least a portion of the second conductive part extend into the housing cavity of the shell, and the first conductive member in the brake assembly is movably arranged in the housing cavity along a second direction intersecting the first direction, and the first conductive member is configured to be connected to the first conductive part and the second conductive part and can be controlled to disconnect the connection between the first conductive part and the second conductive part. In the above structure, since the first conductive member connected to the first conductive part and the second conductive part is configured to be controlled to disconnect the connection between the first conductive part and the second conductive part, the disconnection of the first conductive part and the second conductive part of the battery device in the thermal runaway state is achieved, the circuit of the battery device is cut off, and the possibility of further thermal runaway of the battery device is reduced, which is conducive to improving the reliability of the battery device.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0027] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0028] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0029] Figure 3 A schematic diagram of the connection of a battery cell assembly in a battery device provided in some embodiments of the present application;

[0030] Figure 4 A schematic diagram of the structure of a battery device provided in the first embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a battery device provided in the second embodiment of the present application;

[0032] Figure 6 A schematic diagram of the structure of a battery device provided in the third embodiment of the present application;

[0033] Figure 7 A schematic diagram of the structure of a battery device provided in the fourth embodiment of the present application;

[0034] Figure 8 A schematic diagram of the structure of a battery device provided in the fifth embodiment of the present application;

[0035] Fig. 9 This is a schematic structural diagram of a battery device provided in the sixth embodiment of the present application.

[0036] In the attached figure:

[0037] 1. Conductive member; 11. First conductive part; 12. Second conductive part; 2. Actuating assembly; 21. Shell; 211. Connecting port; 22. First conductive member; 23. Second conductive member; 24. First cavity; 241. First sub-cavity; 242. Second sub-cavity; 25. Second cavity; 20. Third conductive member; 251. Third cavity; 26. Fourth cavity; 261. Third sub-cavity; 262. Fourth sub-cavity; 27. First connecting member; 28. Second connecting member; 29. ​​Frame; 3. Battery cell assembly; 4. Connecting circuit; 5. Protective device; 10. Box; 101. First box; 102. Second box; 1000. Vehicle; 100. Battery device; 1001. Battery cell; 200. Controller; 300. Motor; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0040] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0044] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-9°, the two directions can be considered to be perpendicular; if the angle between two directions is 5°-5°, the two directions can be considered to be parallel.

[0045] The term “plurality” used in this application refers to two or more (including two).

[0046] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0047] The battery device mentioned in the embodiments of the present application refers to a single physical module including a plurality of battery cells to provide higher voltage and capacity.

[0048] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0049] The battery cells may be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0050] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector. The negative electrode can be a negative electrode sheet, which can include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

[0051] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0052] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive electrode and the negative electrode. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0053] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0054] In some embodiments, the electrode assembly may be a wound structure or a stacked structure.

[0055] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0056] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery cell, such as a hexagonal battery cell.

[0057] In some embodiments, the battery device may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module, and the multiple battery cells in the battery module are electrically connected.

[0058] In some embodiments, the battery device may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0059] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0060] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0061] As the application scope of battery devices becomes wider and wider, people have higher and higher requirements for the reliability of battery devices. In the related art, when the battery enters or is about to enter the thermal runaway state, the control system of the battery device can actively disconnect the circuit of the battery device, but the circuit in this solution is not physically disconnected, which still has certain risks and is not conducive to improving the reliability of the battery device.

[0062] In order to improve the reliability of the battery device, some embodiments of the present application provide a battery device, which includes a battery cell assembly, a connection circuit and a protection device, wherein the conductive member of the protection device is connected in series in the connection circuit, wherein the first conductive part and the second conductive part are arranged opposite to each other along a first direction, at least part of the first conductive part and at least part of the second conductive part extend into the housing cavity of the shell, and the first conductive member in the brake assembly is movably arranged in the housing cavity along a second direction intersecting with the first direction, and the first conductive member is configured to be connected to the first conductive part and the second conductive part and can be controlled to disconnect the connection between the first conductive part and the second conductive part. In the above structure, since the first conductive member connected to the first conductive part and the second conductive part is configured to be controlled to disconnect the connection between the first conductive part and the second conductive part, the disconnection of the first conductive part and the second conductive part of the battery device in the thermal runaway state is realized, the circuit of the battery device is cut off, and the possibility of further thermal runaway of the battery device is reduced, which is conducive to improving the reliability of the battery device.

[0063] The battery device described in the embodiment of the present application is suitable for an electrical device using the battery device. The battery device can be used for, but not limited to, battery devices, and can also be used for vehicles, aircraft, ships, electronic equipment, power tools and other products, which can improve the reliability of these products.

[0064] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Vehicles may be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include aircraft, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0065] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0066] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0067] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0068] Please refer to Figure 2 , Figure 2 An exploded view of a battery device 100 provided for some embodiments of the present application. The battery device 100 includes a housing 10 and a battery cell 1001, and the battery cell 1001 is accommodated in the housing 10. Among them, the housing 10 is used to provide a storage space for the battery cell 1001. There can be multiple battery cells 1001 in the battery device 100, and the multiple battery cells 1001 can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 1001 are both connected in series and in parallel. Multiple battery cells 1001 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 1001 is accommodated in the housing 10; of course, the battery device 100 can also be a battery module in which multiple battery cells 1001 are first connected in series, in parallel, or in mixed connection, and the multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the housing 10.

[0069] The box 10 may include a first box 101 and a second box 102, and the first box 101 and the second box 102 cover each other to define a placement space for accommodating the battery cell 1001. The first box 101 and the second box 102 may be in various shapes, such as a cuboid, a cylinder, etc. The first box 101 may be a hollow structure with one side open, and the second box 102 may also be a hollow structure with one side open, and the open side of the second box 102 covers the open side of the first box 101, thereby forming a box 10 with a placement space.

[0070] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing electrical connection between the plurality of battery cells 1001 .

[0071] Each battery cell 1001 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 1001 may be cylindrical, flat, rectangular, or in other shapes.

[0072] The technical solutions of the battery device and the power-consuming device provided in the specific implementation manner of the present application are further described below.

[0073] Some embodiments of the present application provide a battery device 100, referring to Figure 3 The battery device 100 includes a battery cell assembly 3, a connecting line 4 and a protection device 5, wherein the connecting line 4 is used to electrically connect the battery cell assembly 3. Figure 4 The protection device 5 includes a conductive member 1 and an actuating assembly 2. The conductive member 1 includes a first conductive portion 11 and a second conductive portion 12 arranged opposite to each other along a first direction X; the actuating assembly 2 includes a shell 21 and a first conductive member 22. The shell 21 forms a cavity. At least a portion of the first conductive portion 11 extends into the cavity. At least a portion of the second conductive portion 12 extends into the cavity. The first conductive member 22 is movably arranged in the cavity along a second direction Y. The second direction Y is arranged to intersect with the first direction X. The first conductive member 22 is configured to be connected to the first conductive portion 11 and the second conductive portion 12 and can be controlled to disconnect the connection between the first conductive portion 11 and the second conductive portion 12.

[0074] The connection line 4 electrically connects the battery cell assembly 3 so that the battery cell assembly 3 can be charged through the connection line 4 , and can also be discharged to the outside through the connection line 4 , and different battery cell assemblies 3 can also be electrically connected.

[0075] By connecting the conductive member 1 of the protection device 5 of the battery device 100 in series with the connecting line 4 , the conductive member 1 can connect or disconnect the circuit passing through the connecting line 4 .

[0076] In some embodiments, reference Figure 3 There are multiple battery cell assemblies 3, and the multiple battery cell assemblies 3 are connected in series through a connecting line 4.

[0077] By connecting a plurality of battery cell assemblies 3 in series using the connection line 4 , the battery device 100 composed of the plurality of battery cell assemblies 3 can provide a higher voltage and more power, so that the battery device 100 can better store electrical energy.

[0078] The protection device 5 may be a device for protecting the battery device 100 when thermal runaway occurs in the battery device 100. The conductive member 1 may be a device capable of conducting electricity, which is used to be set in the circuit of the battery device 100 so that the current in the circuit of the battery device 100 flows through the conductive member 1. Exemplarily, the circuit of the battery device 100 may be a charging circuit of the battery device 100, or a discharging circuit of the battery device 100, or a connecting circuit 4 connecting different battery cell assemblies 3 in the battery device 100.

[0079] The first conductive portion 11 and the second conductive portion 12 may be two structural parts arranged at a relative interval in the conductive member 1 along the first direction X. The first direction X may be the direction in which the conductive member 1 extends. The conductive member 1 is arranged in the circuit of the battery device 100, and the first conductive portion 11 and the second conductive portion 12 may be connected in series in the circuit of the battery device 100, so that the connection or disconnection of the first conductive portion 11 and the second conductive portion 12 can realize the connection or disconnection of the circuit of the battery device 100.

[0080] The actuating assembly 2 may be a component in the protective device 5 of the battery device 100 that can be operated to connect or disconnect the first conductive part 11 and the second conductive part 12. The housing 21 may be a shell-like structure in the actuating assembly 2, which is formed with a cavity for accommodating other components in the actuating assembly 2. By extending at least a portion of the first conductive part 11 into the cavity and extending at least a portion of the second conductive part 12 into the cavity, the first conductive part 11 can be connected to the component in the cavity and the second conductive part 12 can be connected to the component in the cavity.

[0081] Exemplarily, the shell 21 is made of insulating material, so that the first conductive part 11, the second conductive part 12 and the first conductive member 22 are all insulated from the shell 21, so that the first conductive part 11 and the second conductive part 12 can be electrically connected only when the first conductive member 22 is connected to the first conductive part 11 and the second conductive part 12.

[0082] The first conductive member 22 may be a conductive component disposed in the cavity of the actuating assembly 2 .

[0083] The first conductive member 22 is movably disposed in the cavity along the second direction Y, and the second direction Y is intersected with the first direction X, so that the first conductive member 22 can connect or disconnect the first conductive part 11 and the second conductive part 12 during movement along the second direction Y in the cavity.

[0084] Exemplarily, the second direction Y is perpendicular to the first direction X, so that when the first conductive member 22 moves along the second direction Y, it can move relatively quickly relative to the first conductive portion 11 and the second conductive portion 12 .

[0085] The first conductive member 22 is configured to be able to controllably disconnect the connection between the first conductive portion 11 and the second conductive portion 12, which may mean that, when a preset condition is met, the first conductive member 22 is controlled or acted upon to move and disconnect the connection between the first conductive portion 11 and the second conductive portion 12. Exemplarily, the first conductive member 22 is controlled to disconnect the connection between the first conductive portion 11 and the second conductive portion 12, which may mean that the first conductive member 22 receives a control signal, moves under the control of the control signal and disconnects the connection between the first conductive portion 11 and the second conductive portion 12; or, when the battery device has thermal runaway, the first conductive member 22 moves under the action of pressure and disconnects the connection between the first conductive portion 11 and the second conductive portion 12.

[0086] By configuring the first conductive member 22 to be connected to the first conductive portion 11 and the second conductive portion 12 and to be controllably disconnected from the first conductive portion 11 and the second conductive portion 12, when the battery device 100 is not in thermal runaway, the first conductive member 22 located in the cavity is connected between the first conductive portion 11 and the second conductive portion 12 so as to connect the circuit; and when the battery device 100 is in thermal runaway, the first conductive member 22 is disconnected from the first conductive portion 11 and the second conductive portion 12 so as to disconnect the circuit, so that the first conductive member 22 can connect the circuit when the battery device 100 is not in thermal runaway, and can disconnect the circuit when the battery device 100 is in thermal runaway.

[0087] In the above structure, since the first conductive member 22 connected to the first conductive part 11 and the second conductive part 12 is configured to disconnect the first conductive part 11 and the second conductive part 12 when the battery device 100 has thermal runaway, the first conductive part 11 and the second conductive part 12 are disconnected, the circuit of the battery device 100 is cut off, and the possibility of further thermal runaway of the battery device 100 is reduced, which is beneficial to improving the reliability of the battery device 100.

[0088] In some embodiments, the first conductive member 22 is sealingly and slidably connected to the inner wall of the cavity and divides the cavity into a first cavity 24 and a second cavity 25. The shell 21 is provided with a connecting port 211 connected to the first cavity 24, and the connecting port 211 is used to connect with the internal space of the battery device 100; the first conductive member 22 is configured to disconnect the first conductive part 11 and the second conductive part 12 when the pressure of the internal space of the battery device 100 reaches a first preset value.

[0089] The first conductive member 22 is sealingly slidably connected to the inner wall of the cavity, so that the first conductive member 22 is sealingly slidably fitted in the cavity, which separates the cavity into two independent first cavities 24 and second cavities 25. The first cavity 24 and the second cavity 25 are arranged along the second direction Y.

[0090] The communication port 211 may be an opening structure provided on the shell 21, which penetrates along the thickness direction of the wall of the shell 21 to connect the cavity with the outside of the shell 21, so that the outside of the shell 21 can ventilate into the cavity. By connecting the communication port 211 with the first cavity 24, and making the communication port 211 communicate with the internal space of the battery device 100, the smoke generated when the battery device 100 has thermal runaway increases the pressure of the first cavity 24 while increasing the pressure of the internal space of the battery device 100.

[0091] By configuring the first conductive member 22 to disconnect the first conductive portion 11 and the second conductive portion 12 when the pressure of the internal space of the battery device 100 reaches a first preset value, when thermal runaway of the battery device 100 occurs and the pressure of the internal space of the battery device 100 reaches the first preset value, the first conductive member 22 cuts off the electrical connection between the first conductive portion 11 and the second conductive portion 12 to cut off the circuit of the battery device 100, thereby reducing the possibility of further aggravation of the thermal runaway of the battery device 100.

[0092] In some embodiments, reference Figure 5 The actuating assembly 2 further includes a second conductive member 23, which is movably disposed in the first cavity 24 along the second direction Y and is spaced apart from the first conductive member 22. The second conductive member 23 is located between the first conductive member 22 and the connecting port 211, and the first conductive member 22 and the second conductive member 23 transmit to each other; when the pressure of the internal space of the battery device 100 reaches a first preset value, the second conductive member 23 is connected to the first conductive portion 11 and the second conductive portion 12; when the pressure of the internal space of the battery device 100 reaches a second preset value, the second conductive member 23 and the first conductive member 22 are both disconnected from the first conductive portion 11 and the second conductive portion 12, and the second preset value is higher than the first preset value.

[0093] The second conductive member 23 may be a conductive component disposed in the first cavity 24 of the actuating assembly 2 .

[0094] The second conductive member 23 is movably disposed in the first cavity 24 along the second direction Y, so that when the second conductive member 23 moves along the second direction Y in the first cavity 24 , the first conductive portion 11 and the second conductive portion 12 can be connected or disconnected.

[0095] By making the first conductive member 22 and the second conductive member 23 transmit each other, the second conductive member 23 and the first conductive member 22 can move synchronously along the second direction Y and connect the first connecting portion and the second connecting portion alternately.

[0096] When the pressure of the internal space of the battery device 100 reaches the first preset value, the second conductive member 23 is connected to the first conductive part 11 and the second conductive part 12. This may mean that when the battery device 100 has a thermal runaway and the pressure of the internal space reaches the first preset value, the first conductive member 22 disconnects from the first conductive part 11 and the second conductive part 12 and the second conductive member 23 is connected to the first conductive part 11 and the second conductive part 12, so that the connection between the first conductive part 11 and the second conductive part 12 is switched from the first conductive member 22 to the second conductive member 23.

[0097] By disconnecting the second conductive member 23 and the first conductive member 22 from the first conductive portion 11 and the second conductive portion 12 when the pressure of the internal space of the battery device 100 reaches a second preset value higher than the first preset value, it can be understood that when the battery device 100 undergoes thermal diffusion to generate more smoke, so that the pressure of the internal space of the battery device 100 further increases to the second preset value, the second conductive member 23 and the first conductive member 22 both disconnect from the first conductive portion 11 and the second conductive portion 12 under the action of the high-pressure gas, so that the electrical connection between the first conductive portion 11 and the second conductive portion 12 is disconnected, so that the circuit of the battery device 100 is cut off, which is conducive to reducing the possibility of further aggravation of thermal diffusion of the battery device 100.

[0098] By spacing the second conductive member 23 from the first conductive member 22, the electrical connection between the first connection portion and the second connection portion changes during the switching process of the first connection portion and the second connection portion, which can cause a current change in the circuit, thereby facilitating issuing a warning of thermal runaway of the battery device 100 through the current change.

[0099] In some embodiments, the distance between the second conductive element 23 and the first conductive element 22 in the second direction Y is A, the smallest of the size of the first conductive portion 11 in the second direction Y and the size of the second conductive portion 12 in the second direction Y is B, and A>B.

[0100] By setting the distance between the second conductive member 23 and the first conductive member 22 in the second direction Y to A, and setting the smallest one of the size of the first conductive part 11 in the second direction Y and the size of the second conductive part 12 in the second direction Y to B, so that A>B, during the switching process between the first connection part and the second connection part, the first conductive part 11 and the second conductive part 12 are not connected, and during the switching process between the first connection part and the second connection part, the first connection part and the second connection part are electrically disconnected, so that the circuit can issue a warning that the battery device 100 has thermal runaway by cutting off the current.

[0101] In some embodiments, the actuating assembly 2 further includes a first connecting member 27 , and the first connecting member 27 is connected to the first conductive member 22 and the second conductive member 23 .

[0102] The first connecting member 27 may be a component for connecting the first conductive member 22 and the second conductive member 23, and the first connecting member 27 is used to transmit the force between the first conductive member 22 and the second conductive member 23. By connecting the first connecting member 27 between the first conductive member 22 and the second conductive member 23, the first conductive member 22 and the second conductive member 23 can be mutually transmitted, so that the first conductive member 22 and the second conductive member 23 can move synchronously.

[0103] Exemplarily, the first connecting member 27 may be a rod-shaped member or a block-shaped member, which is connected between the first conductive member 22 and the second conductive member 23 so that the first conductive member 22 and the second conductive member 23 move synchronously.

[0104] In some embodiments, reference Figure 6 The second conductive member 23 is sealingly and slidably connected to the inner wall of the first cavity 24 and divides the first cavity 24 into a first sub-cavity 241 and a second sub-cavity 242 . The second sub-cavity 242 is located between the first conductive member 22 and the second conductive member 23 . The first sub-cavity 241 is connected to the connecting port 211 .

[0105] The second conductive member 23 is sealingly and slidably connected to the inner wall of the first cavity 24 , so that the second conductive member 23 is sealingly and slidably fitted in the first cavity 24 , which separates the first cavity 24 into two independent first sub-cavity 241 and second sub-cavity 242 .

[0106] The first sub-cavity 241 and the second sub-cavity 242 are arranged along the second direction Y, wherein the second sub-cavity 242 is located between the first conductive member 22 and the second conductive member 23. By connecting the communication port 211 with the first sub-cavity 241, the second sub-cavity 242 and the second cavity 25 are sealed cavities. When the smoke generated when the battery device 100 has thermal runaway increases the pressure of the first sub-cavity 241, the gas in the first sub-cavity 241 pushes the second conductive member 23 to move along the second direction Y toward the direction where the first conductive member 22 is located, and then the gas in the second sub-cavity 242 is compressed and pushes the first conductive member 22 to move along the second direction Y in a direction away from the second conductive member 23.

[0107] In some embodiments, reference Figure 7The first conductive member 22 is sealingly and slidably connected to the inner wall of the cavity and divides the cavity into a third cavity 251 and a fourth cavity 26. The thermal expansion coefficient of the first material in the fourth cavity 26 is greater than the thermal expansion coefficient of the second material in the third cavity 251. The fourth cavity 26 transfers heat with the battery cell assembly 3. When the internal temperature of the battery device 100 reaches the third preset value, the first material pushes the first conductive member 22 to disconnect the first conductive part 11 and the second conductive part 12.

[0108] The first conductive member 22 is sealingly and slidably connected to the inner wall of the cavity, and divides the cavity into two independent third cavities 251 and fourth cavities 26. The third cavities 251 and fourth cavities 26 are both independent sealed cavities and arranged along the second direction Y.

[0109] By setting the first substance in the fourth cavity 26 and the second substance in the third cavity 251, heat is transferred between the fourth cavity 26 and the battery cell assembly 3, and the thermal expansion coefficient of the first substance is greater than the thermal expansion coefficient of the second substance. When the battery device 100 experiences thermal runaway and the temperature rises, the volume expansion rate of the first substance in the fourth cavity 26 will be greater than the volume expansion rate of the second substance in the third cavity 251, and the first conductive member 22 will move toward the third cavity 251 under the push of the first substance.

[0110] When the internal temperature of the battery device 100 reaches the third preset value, the first material pushes the first conductive member 22 to disconnect the first conductive portion 11 and the second conductive portion 12, so that when thermal runaway of the battery device 100 occurs and the internal temperature of the battery device 100 reaches the third preset value, the first conductive member 22 cuts off the electrical connection between the first conductive portion 11 and the second conductive portion 12 to cut off the circuit of the battery device 100, thereby reducing the possibility of further aggravation of the thermal runaway of the battery device 100.

[0111] In some embodiments, reference Figure 8 The actuating assembly 2 further includes a third conductive member 20, which is movably disposed in the fourth cavity 26 along the second direction Y and is spaced apart from the first conductive member 22, and the first conductive member 22 and the third conductive member 20 are mutually transmitted; when the internal temperature of the battery device 100 reaches a third preset value, the third conductive member 20 is connected to the first conductive portion 11 and the second conductive portion 12; when the internal temperature of the battery device 100 reaches a fourth preset value, the third conductive member 20 and the first conductive member 22 are both disconnected from the first conductive portion 11 and the second conductive portion 12, and the fourth preset value is higher than the third preset value.

[0112] The third conductive member 20 may be a conductive component disposed in the cavity of the actuating assembly 2 .

[0113] The third conductive member 20 is movably disposed in the fourth cavity 26 along the second direction Y, so that when the second conductive member 23 moves along the second direction Y in the fourth cavity 26 , the first conductive portion 11 and the second conductive portion 12 can be connected or disconnected.

[0114] By making the first conductive member 22 and the third conductive member 20 drive each other, the third conductive member 20 and the first conductive member 22 can move synchronously along the second direction Y and connect the first connecting portion and the second connecting portion alternately.

[0115] When the internal temperature of the battery device 100 reaches the third preset value, the third conductive member 20 is connected to the first conductive part 11 and the second conductive part 12. This may mean that when the battery device 100 has thermal runaway and the internal temperature rises to the third preset value, the first conductive member 22 disconnects from the first conductive part 11 and the second conductive part 12 and the third conductive member 20 is connected to the first conductive part 11 and the second conductive part 12, so that the connection between the first conductive part 11 and the second conductive part 12 is switched from the first conductive member 22 to the third conductive member 20.

[0116] By disconnecting the third conductive member 20 and the first conductive member 22 from the first conductive portion 11 and the second conductive portion 12 when the internal temperature of the battery device 100 rises to a fourth preset value higher than the third preset value, it can be understood that when the battery device 100 undergoes thermal diffusion to generate more heat, so that when the internal temperature of the battery device 100 further rises to the fourth preset value, the third conductive member 20 and the first conductive member 22 both disconnect from the first conductive portion 11 and the second conductive portion 12 under the action of the first substance, so that the electrical connection between the first conductive portion 11 and the second conductive portion 12 is disconnected, so that the circuit of the battery device 100 is cut off, which is conducive to reducing the possibility of further aggravation of thermal diffusion of the battery device 100.

[0117] In some embodiments, the actuating assembly 2 further includes a second connecting member 28 , which is connected to the first conductive member 22 and the third conductive member 20 .

[0118] The second connecting member 28 may be a component for connecting the first conductive member 22 and the second conductive member 23, and the second connecting member 28 is used to transmit the force between the first conductive member 22 and the second conductive member 23. By connecting the second connecting member 28 between the first conductive member 22 and the second conductive member 23, the first conductive member 22 and the second conductive member 23 can be mutually driven, so that the first conductive member 22 and the second conductive member 23 can move synchronously.

[0119] Exemplarily, the second connecting member 28 may be a rod-shaped member or a block-shaped member, which is connected between the first conductive member 22 and the second conductive member 23 so that the first conductive member 22 and the second conductive member 23 move synchronously.

[0120] In some embodiments, reference Fig. 9 The third conductive member 20 is sealingly and slidably connected to the inner wall of the fourth cavity 26 and divides the fourth cavity 26 into a third sub-cavity 261 and a fourth sub-cavity 262 . The third sub-cavity 261 is located between the third conductive member 20 and the first conductive member 22 . The first substance is disposed in the fourth sub-cavity 262 .

[0121] The third conductive member 20 is sealingly and slidably connected to the inner wall of the first cavity 24 , so that the third conductive member 20 is sealingly and slidably fitted in the first cavity 24 , dividing the first cavity 24 into two independent and sealed third sub-cavity 261 and fourth sub-cavity 262 .

[0122] The third sub-cavity 261 and the fourth sub-cavity 262 are arranged along the second direction Y, wherein the third sub-cavity 261 is located between the first conductive member 22 and the third conductive member 20. By arranging the first substance in the fourth sub-cavity 262, when the first substance is heated and expanded when thermal runaway occurs in the battery device 100, the first substance pushes the third conductive member 20 to move along the second direction Y toward the direction where the first conductive member 22 is located, and then the gas in the third sub-cavity 261 is compressed and pushes the first conductive member 22 to move along the second direction Y away from the third conductive member 20, so as to realize the connection or disconnection of the third conductive member 20 with the first conductive portion 11 and the second conductive portion 12.

[0123] In some embodiments, the protection device 5 of the battery device 100 further includes a frame 29 , and the housing 21 , the first conductive portion 11 , and the second conductive portion 12 are connected to the frame 29 .

[0124] The frame 29 may be a structure disposed outside the protection device 5 of the battery device 100 , which is used to protect other components in the protection device 5 of the battery device 100 , thereby reducing the possibility of damage to the protection device 5 of the battery device 100 and helping to improve the reliability of the protection device 5 of the battery device 100 .

[0125] Exemplarily, the frame 29 can be made of thermosetting plastics such as phenolic plastics, epoxy plastics, amino plastics, etc., so that the frame 29 is not easily softened when heated, which is beneficial to improving the stability of the frame 29.

[0126] The housing 21 , the first conductive portion 11 and the second conductive portion 12 are connected to the frame 29 , so that the various components in the protection device 5 of the battery device 100 can be connected into an integral structure, thereby improving the integrity of the protection device 5 of the battery device 100 .

[0127] Some embodiments of the present application further provide an electrical device, which includes the battery device 100 provided by the above technical solution, and the battery device 100 is used to provide electrical energy.

[0128] Some embodiments of the present application provide a battery device 100, which includes a battery cell assembly 3, a connecting line 4 and a protective device 5, wherein the connecting line 4 is used to electrically connect the battery cell assembly 3, and the protective device 5 includes a conductive member 1 and an actuating assembly 2, wherein a first conductive portion 11 and a second conductive portion 12 in the conductive member 1 are arranged relatively to each other along a first direction X, and at least a portion of the first conductive portion 11 and at least a portion of the second conductive portion 12 extend into a cavity of a shell 21, and a first conductive member 22 and a second conductive member 23 in the braking device are sealed and slidably connected to an inner wall of the cavity along a second direction Y intersecting the first direction X, so as to divide the cavity into a first sub-cavity 241, a second sub-cavity 242 and a second cavity 25, wherein the second sub-cavity 242 is located between the first conductive member 22 and the second conductive member 23, and both the second sub-cavity 242 and the second cavity 25 are sealed cavities, and the first sub-cavity 241 is connected to the first cavity 24 through a connecting port 211.

[0129] In the above structure, since the first conductive member 22 connected to the first conductive part 11 and the second conductive part 12 is configured to disconnect the first conductive part 11 and the second conductive part 12 when the battery device 100 has thermal runaway, the first conductive part 11 and the second conductive part 12 are disconnected, the circuit of the battery device 100 is cut off, and the possibility of further thermal runaway of the battery device 100 is reduced, which is beneficial to improving the reliability of the battery device 100.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cell assembly; A connecting line for electrically connecting the battery cell assembly; A protection device, comprising a conductive member and an actuating assembly, wherein the conductive member is connected in series in the connecting line, and the conductive member comprises a first conductive portion and a second conductive portion which are arranged opposite to each other along a first direction; The actuating assembly includes a shell and a first conductive member, the shell forms a cavity, at least part of the first conductive part extends into the cavity, at least part of the second conductive part extends into the cavity, the first conductive member is movably arranged in the cavity along a second direction, and the second direction is arranged to intersect with the first direction; the first conductive member is configured to be connected to the first conductive part and the second conductive part and can be controlled to disconnect the connection between the first conductive part and the second conductive part.

2. The battery device according to claim 1, characterized in that: The first conductive member is sealingly and slidably connected to the inner wall of the cavity and divides the cavity into a first cavity and a second cavity. The shell is provided with a connecting port connected to the first cavity, and the connecting port is connected to the internal space of the battery device. The first conductive member is configured to disconnect the first conductive part and the second conductive part when the pressure of the internal space of the battery device reaches a first preset value.

3. The battery device according to claim 2, characterized in that: The actuating assembly also includes a second conductive member, which is movably disposed in the first cavity along the second direction and spaced apart from the first conductive member, and is located between the first conductive member and the connecting port, and the first conductive member and the second conductive member transmit to each other; when the pressure of the internal space of the battery device reaches a first preset value, the second conductive member is connected to the first conductive part and the second conductive part; when the pressure of the internal space of the battery device reaches a second preset value, the second conductive member and the first conductive member both disconnect from the first conductive part and the second conductive part, and the second preset value is higher than the first preset value.

4. The battery device according to claim 3, characterized in that: The distance between the second conductive member and the first conductive member in the second direction is A, the smallest of the size of the first conductive portion in the second direction and the size of the second conductive portion in the second direction is B, and A>B.

5. The battery device according to claim 3, characterized in that: The actuating assembly further includes a first connecting member connected to the first conductive member and the second conductive member.

6. The battery device according to claim 3, characterized in that: The second conductive member is sealingly and slidably connected to the inner wall of the first cavity and divides the first cavity into a first sub-cavity and a second sub-cavity. The second sub-cavity is located between the first conductive member and the second conductive member. The first sub-cavity is connected to the communication port.

7. The battery device according to claim 1, characterized in that: The first conductive member is sealingly and slidably connected to the inner wall of the cavity and divides the cavity into a third cavity and a fourth cavity, the thermal expansion coefficient of the first substance in the fourth cavity is greater than the thermal expansion coefficient of the second substance in the third cavity, and the fourth cavity is heat-transferred to the battery cell assembly; when the internal temperature of the battery device reaches a third preset value, the first substance pushes the first conductive member to disconnect the first conductive part and the second conductive part.

8. The battery device according to claim 7, characterized in that: The actuating assembly further includes a third conductive member, which is movably disposed in the fourth cavity along the second direction and spaced apart from the first conductive member, and the first conductive member and the third conductive member transmit to each other; when the internal temperature of the battery device reaches a third preset value, the third conductive member is connected to the first conductive part and the second conductive part; when the internal temperature of the battery device reaches a fourth preset value, the third conductive member and the first conductive member both disconnect from the first conductive part and the second conductive part, and the fourth preset value is higher than the third preset value.

9. The battery device according to claim 8, characterized in that: The actuating assembly further includes a second connecting member connected to the first conductive member and the third conductive member.

10. The battery device according to claim 8, characterized in that: The third conductive member is sealingly and slidably connected to the inner wall of the fourth cavity and divides the fourth cavity into a third sub-cavity and a fourth sub-cavity. The third sub-cavity is located between the third conductive member and the first conductive member. The first substance is arranged in the fourth sub-cavity.

11. The battery device according to claim 1, characterized in that: The battery device further includes a frame, and the housing, the first conductive portion, and the second conductive portion are connected to the frame.

12. The battery device according to any one of claims 1 to 11, characterized in that: The battery cell assemblies are provided in plurality, and the plurality of battery cell assemblies are connected in series via the connection line.

13. An electrical device, characterized in that: A battery device comprising a battery as claimed in any one of claims 1 to 12, wherein the battery is used to provide electrical energy.

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